cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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quota.c (2920B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * quota.c - NTFS kernel quota ($Quota) handling.  Part of the Linux-NTFS
      4 *	     project.
      5 *
      6 * Copyright (c) 2004 Anton Altaparmakov
      7 */
      8
      9#ifdef NTFS_RW
     10
     11#include "index.h"
     12#include "quota.h"
     13#include "debug.h"
     14#include "ntfs.h"
     15
     16/**
     17 * ntfs_mark_quotas_out_of_date - mark the quotas out of date on an ntfs volume
     18 * @vol:	ntfs volume on which to mark the quotas out of date
     19 *
     20 * Mark the quotas out of date on the ntfs volume @vol and return 'true' on
     21 * success and 'false' on error.
     22 */
     23bool ntfs_mark_quotas_out_of_date(ntfs_volume *vol)
     24{
     25	ntfs_index_context *ictx;
     26	QUOTA_CONTROL_ENTRY *qce;
     27	const le32 qid = QUOTA_DEFAULTS_ID;
     28	int err;
     29
     30	ntfs_debug("Entering.");
     31	if (NVolQuotaOutOfDate(vol))
     32		goto done;
     33	if (!vol->quota_ino || !vol->quota_q_ino) {
     34		ntfs_error(vol->sb, "Quota inodes are not open.");
     35		return false;
     36	}
     37	inode_lock(vol->quota_q_ino);
     38	ictx = ntfs_index_ctx_get(NTFS_I(vol->quota_q_ino));
     39	if (!ictx) {
     40		ntfs_error(vol->sb, "Failed to get index context.");
     41		goto err_out;
     42	}
     43	err = ntfs_index_lookup(&qid, sizeof(qid), ictx);
     44	if (err) {
     45		if (err == -ENOENT)
     46			ntfs_error(vol->sb, "Quota defaults entry is not "
     47					"present.");
     48		else
     49			ntfs_error(vol->sb, "Lookup of quota defaults entry "
     50					"failed.");
     51		goto err_out;
     52	}
     53	if (ictx->data_len < offsetof(QUOTA_CONTROL_ENTRY, sid)) {
     54		ntfs_error(vol->sb, "Quota defaults entry size is invalid.  "
     55				"Run chkdsk.");
     56		goto err_out;
     57	}
     58	qce = (QUOTA_CONTROL_ENTRY*)ictx->data;
     59	if (le32_to_cpu(qce->version) != QUOTA_VERSION) {
     60		ntfs_error(vol->sb, "Quota defaults entry version 0x%x is not "
     61				"supported.", le32_to_cpu(qce->version));
     62		goto err_out;
     63	}
     64	ntfs_debug("Quota defaults flags = 0x%x.", le32_to_cpu(qce->flags));
     65	/* If quotas are already marked out of date, no need to do anything. */
     66	if (qce->flags & QUOTA_FLAG_OUT_OF_DATE)
     67		goto set_done;
     68	/*
     69	 * If quota tracking is neither requested, nor enabled and there are no
     70	 * pending deletes, no need to mark the quotas out of date.
     71	 */
     72	if (!(qce->flags & (QUOTA_FLAG_TRACKING_ENABLED |
     73			QUOTA_FLAG_TRACKING_REQUESTED |
     74			QUOTA_FLAG_PENDING_DELETES)))
     75		goto set_done;
     76	/*
     77	 * Set the QUOTA_FLAG_OUT_OF_DATE bit thus marking quotas out of date.
     78	 * This is verified on WinXP to be sufficient to cause windows to
     79	 * rescan the volume on boot and update all quota entries.
     80	 */
     81	qce->flags |= QUOTA_FLAG_OUT_OF_DATE;
     82	/* Ensure the modified flags are written to disk. */
     83	ntfs_index_entry_flush_dcache_page(ictx);
     84	ntfs_index_entry_mark_dirty(ictx);
     85set_done:
     86	ntfs_index_ctx_put(ictx);
     87	inode_unlock(vol->quota_q_ino);
     88	/*
     89	 * We set the flag so we do not try to mark the quotas out of date
     90	 * again on remount.
     91	 */
     92	NVolSetQuotaOutOfDate(vol);
     93done:
     94	ntfs_debug("Done.");
     95	return true;
     96err_out:
     97	if (ictx)
     98		ntfs_index_ctx_put(ictx);
     99	inode_unlock(vol->quota_q_ino);
    100	return false;
    101}
    102
    103#endif /* NTFS_RW */